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84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsIImageManager_h___
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#define nsIImageManager_h___
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#include <stdio.h>
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#include "nsISupports.h"
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#include "nscore.h"
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typedef enum
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{
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nsImageType_kUnknown = 0,
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nsImageType_kGIF = 1,
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nsImageType_kXBM = 2,
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nsImageType_kJPEG = 3,
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nsImageType_kPPM = 4,
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nsImageType_kPNG = 5
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} nsImageType;
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// IID for the nsIImageManager interface
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#define NS_IIMAGEMANAGER_IID \
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{ 0x9f327100, 0xad5a, 0x11d1, \
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{ 0x9b, 0xc3, 0x00, 0x60, 0x08, 0x8c, 0xa6, 0xb3 } }
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/**
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*
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* Image manager. There is only a single instance, returned when invoking
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* the factory instantiation method. A user of the image library should
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* hold on to the singleton image manager.
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*/
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class nsIImageManager : public nsISupports
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{
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public:
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/// Initialization method to be called before use
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virtual nsresult Init() = 0;
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/// Set the size (in bytes) image cache maintained by the image manager
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virtual void SetCacheSize(PRInt32 aCacheSize) = 0;
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/// @return the current size of the image cache (in bytes)
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virtual PRInt32 GetCacheSize(void) = 0;
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/**
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* Attempts to release some memory by freeing an image from the image
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* cache. This may not always be possible either because all images
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* in the cache are in use or because the cache is empty.
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*
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* @return the new approximate size of the imagelib cache.
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*/
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virtual PRInt32 ShrinkCache(void) = 0;
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/**
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* Determine the type of the image, based on the first few bytes of data.
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*
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* @param buf - a buffer of image data
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* @param length - the length of the buffer
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*
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* @return the type of the image, if known
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*/
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virtual nsImageType GetImageType(const char *buf, PRInt32 length) = 0;
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};
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/// Factory method to get a reference to the singleton image manager
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extern "C" NS_GFX_(nsresult)
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NS_NewImageManager(nsIImageManager **aInstancePtrResult);
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#endif
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